3. Two new drugs were given to patients with heart disease. The first drug lowered the blood pressure of sixteen patients an average of 11 points, with a standard deviation of 6 points. The second drug lowered the blood pressure of fourteen other patients an average of 12 points, with a standard deviation of 8 points. Determine a 98% con- fidence interval for the difference in the mean reductions in blood pressure, assuming that the measurements are normally distributed with equal variances. Explain if either of these drugs is more effective at reducing blood pressure.